Wu Langxi had stopped the calculation on the blackboard at this time, and smiled embarrassedly: "I'm really sorry, I was also stumped by this topic from Master Li, and I forgot to return to Master Lu for a while, Master Lu, don't be surprised" spoke fluent Chinese, but with a lot of accents from southern Jiangsu and Zhejiang, it should be called Nanjing official dialect in that era.Lu Yinchang snorted at Wu Langxi dissatisfiedly, and asked strangely: "Aren't you teaching this nerd, why did you make him stumped" Wu Langxi sighed: "Actually, your Chinese mathematics is broad and profound, but your emperor doesn't pay attention to it, and no one studies it."
At first, I was teaching Master Li, but I couldn't understand the math problems I found in some ancient books, so I had to study them with Master Li. ”At this time, Li Tianyu was busy looking for a place for Wang Shuo to sit, but it was full of garbage and there was no place to sit.He laughed embarrassedly, and wanted Wang Shuo and them to go back to the living room to sit.Wang Shuo's attention was on the blackboard.A question is written on the blackboard in Chinese: one person enters the door with a pole, the crossbar enters the pole is two feet left, the vertical rod enters the pole is one foot left, the diagonal rod to the opposite corner of the door, and the pole can enter the door.Below the question of how many feet long is the pole is a bunch of equations, written in Arabic numerals.It seems that Europe has realized that the complexity of words and numbers is not conducive to the problem of calculation, and has begun to use Arabic numerals.After reading it, Wang Shuo turned around and said: "This question is very simple, hook three strands, four Xuanwu, and the rod is five feet long."
Do you still need to work so this?"
Hearing Wang Shuo ask, Wu Langxi said: "We also know that the length of the pole is five feet, but it can't be calculated by calculation, it is difficult to calculate it mathematically." ”Wang Shuo looked at Wu Langxi's calculations on the blackboard, most of them were in foreign languages, he couldn't understand them, so he had to follow his own ideas.Could it be that algebra in Europe had not yet been invented at this time, and he wondered in his heart, because although he couldn't understand Wu Langxi's algorithm, judging from the arrangement of the equations, he had gone astray and didn't use algebra.He couldn't remember exactly when Newton's group of scientific geniuses was born.It should be that at this time, he has not been born or has not grown up, otherwise, Newton would have begun to study calculus, which Wu Langxi can't even do algebra and factorization.This is obviously a simple binary equation, the knowledge of middle school.Wang Shuo graduated from university, and this middle school knowledge is too simple for him.Thinking about it in his mind first, Wang Shuo picked up the stone pen and wrote as he spoke: "Let's assume that the rod length is x feet, the door width is x minus two feet, and the door length is x minus one foot."
Then according to the Pythagorean theorem, the square of the door width plus the square of the door length is equal to the square of the rod length x.Lay out the equations and solve the equations. ”Wang Shuo wrote the equation and solved the equation, and the rod length was five feet.The people in the room, including Lu Yinchang, were stunned, what the hell is this Wang Shuo, it is shocking to know Arabic numerals, and it will be this demon-like calculation, and it is completely correct to calculate "ondiue" French: God Wu Langxi involuntarily issued a foreign sentence, and then he didn't care about etiquette, ran over, pointed to the factorization part of Wang Shuo's calculation on the blackboard and asked, "How did you solve this square calculation" Wang Shuo didn't speak, Above the blackboard, he wrote another formula: aaabaaabaaa2abaabb, and said, "This is the theorem, and you can freely convert the equation according to it, and of course, you can also use the open squared method." ”At this time, Wu Langxi was completely trapped.He studied mathematics in Europe, and he just began to know the use of Arabic numerals, and algebra has not yet become popular, that is, he has just come into contact with the skin, so naturally he does not understand these.Through Wu Langxi's expression, Li Tianyu already knew that Wang Shuo had done the right thing.He couldn't help asking: "How does the general understand such a profound question" Wang Shuo then remembered where he was, this is the Ming Dynasty He pondered for a while, and said: "When I was a child, there was a foreigner from Rosa at home, and he taught me. ”Wu Langxi definitely didn't believe this.Renaissance Europe was many times more advanced than agriculture-based Russia, and he had never seen such an algorithm, how could Russia have it, but he was already immersed in that equation, too lazy to ask or not to hear what others were saying.Li Tianyu didn't know what was going on with Rosa, he had just learned to use Arabic numerals instead of Chinese numbers from Wu Langxi, all kinds of addition, subtraction, multiplication and division were suddenly replaced with an easy-to-understand look, multiplication and division of multiple digits were also simple, this seemed to open the door to another world, many problems were solved, no wonder he was so obsessed.And Wang Shuo's arrival seemed to let him see a higher realm of the world.Subsequently, he didn't care about etiquette, and gave Wang Shuo a question: 83,000 bamboo, made into pens and sets, three sets of pens for a regular term, how many pens and sets, after using up these bamboos Wang Shuo still uses algebraic methods to solve, but he thinks a little in the middle.The binary equation can only list one equation, and if you think about it, the pen and the set are equal, so the problem is easily solved.Then Li Tianyu came up with another question: two rats pass through the five-foot wall, rats and mice are one foot a day, and then the rats multiply and the mice are doubled, how long do the rats and mice meet, and how many feet each passes through the wall Binary equation, Wang Shuo easily answered.Li Tianyu was about to ask another question, but Lu Yinchang interrupted him and said: "Okay, the general is busy every day without touching the ground, how can he have time to make such a mess with you, I came to you today to discuss important matters" Wang Shuo changed his mind
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